Lubricating oils containing polyvalent metal hydrocarbyl pyrophosphate salts and amine adducts thereof



3,535,241 LUBRICATING OILS CONTAINING POLYVA- LENT METAL HYDRGCARBYL PYROPHOS- PHATE SALTS AND AMINE ADDUCTS THEREOF Anthony J. Revukas, Cranford, N.J., assignor to Cities Service Oil Company, Bartlesville, Okla, a corporation of Delaware No Drawing. Application May 26, 1965, Ser. No. 459,089. now Patent No. 3,354,189, dated Nov. 21, 1967, which is a continuation-in-part of application Ser. No. 350,113, Mar. 6, 1964. Divided and this application Aug. 17, 1967, Ser. No. 668,983

Int. Cl. (310m 1/46 US. Cl. 252-325 7 Claims ABSTRACT OF THE DISCLOSURE A lubricating composition comprising a substantial quantity of lubricant base material and a minor quantity of a compound having the formula:

wherein M is a polyvalent metal; n is an integer of from to 4; n is an integer of from O to 2; the sum of 11 plus 2n is equal to the valence of the metal and is an integer from 2 to 4; and R, R, R" and R' are hydrocarbyl groups having from 1 to about 30 carbon atoms, and also amine adducts of said polyvalent metal compound wherein n is an integer of from 1 to 4 and n is an integer from 0 to 1.

CROSS-REFERENCE TO RELATED APPLICATION This application is a division of application Ser. No. 459,089 filed May 26, 1965, now Pat. No. 3,354,189, which is in turn, a continuation-in-part of my copending application Ser. No. 350,113 filed Mar. 6, 1964, now Pat. No. 3,401,184.

This invention relates to novel metal organo pyrophosphates, and more particularly to metal (hydrocarbyl pyrophosphates) and metal (acid hydrocarbyl pyrophosphates), and to hydrocarbon compositions containing such com pounds. In other aspects, the invention relates to novel amine adducts of the metal (acid hydrocarbyl pyrophosphates) and to hydrocarbon compositions containing such amine adducts.

Normally liquid hydrocarbon products such as fuels and lubricating oils contain additives for improving their performance characteristics. Thus, in fuels such as gasoline additives are employed for improving various performance characteristics such as to assist in maintaining cleanliness of the carburetor, to resist suface ignition, and to inhibit rust and carburetor icing. Lubricating compositions contain various additives such as those for improving viscosity index and lubricity. The additives vary in effectiveness and it is often necessary to use a number of additives in a single composition.

It has now been found that metal (hydrocarbyl pyrophosphates) and metal (acid hydrocarbyl pyrophosphates) are beneficial for imparting carburetor and intake system detergency, rust suppression, reduction in octane requirements increase, resistance to surface ignition of liquid hydrocarbon fuels, and friction and wear reduction in mineral oil lubricants. It has been further found that reaction products of amines and these metal (acid hydro- 3,535,241 Patented Oct. 20, 1970 carbyl pyrophosphates) are especially advantageous for these purposes. It is to be understood that the term metal as used herein is intended to include silicon, which is normally considered to be a nonmetal.

The metal organo pyrophosphates of the present invention may be generally represented by the formula:

wherein M is a polyvalent metal; 12 is an integer of from 0 to 4; n is an integer from 0 to 2 and the sum of 11 plus 211 is equal to the valence of the metal and is an integer from 2 to 4; and R, R, R and R are hydrocarbyl groups having from 1 to about 30 carbon atoms.

M in the above Formula I represents a polyvalent element having a valence of 2 to 4 and selected from the group consisting of manganese, chromium, molybdenum, copper, gold and silicon and the metals of Groups II, IV, and VIII of the Periodic Table. A suitable Periodic Table is shown on pages 392393 of the Handbook of Chemistry and Physics, Thirty-fifth Edition (1953). It can be seen from Formula I that the metal organo pyrophosphates can have 0, l, 2, 3, or 4 acid groups (OH) per metal atom, but preferably contain at least one acid group. Particularly desirable compounds are the acid hydrocarbyl pyrophosphates of Group IV-B metals, namely titanium, zirconium and hafnium. Compounds of this type are the metal (IVB) di[monoacid di (hydrocarbyl) pyrophosphate] mono [di (hydrocarbyl) pyrophosphate], wherein n is 2 and n is 1; and the metal (IVB) tetra [monoacid di (hydrocarbyl) pyrophosphate], wherein n is 4 and n is 0.

In Formula I above R, R, R and R may represent identical or different hydrocarbyl groups. While any hydrocarbyl groups having between 1 and about 30 carbon atoms and soluble to the required extent in gasoline may be used, the aliphatic hydrocarbyl groups, particularly branched-chain aliphatic hydrocarbyl groups of from 6 to about 22 carbon atoms are preferred. Such groups are generally more soluble in gasoline than other hydrocarbyl groups, thereby facilitating the use of the novel compounds as gasoline additives. Furthermore, the total number of carbon atoms per molecule of metal organo pyrophosphate can vary from about 2 to about 240, but preferably ranges from about 12 to about carbon atoms.

Typical R, R, R" and R groups may include, for instance, alkyl, alkenyl, aryl, alkylaryl, arylalkyl or alicyclic hydrocarbon radicals. Exemplary of suitable hydrocarbyl radicals are: methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tort-butyl, pentyl, isopentyl, hexyl, isohexyl, 2,2,4-trimethylpentyl, Z-methylpentyl, 2,2-dimethylbutyl, 2,3-dimethylbutyl, heptyl, 2-methylhexyl, 3-methylhexyl, 3,3-dimethylpentyl, octyl, 2,3-dimethylhexyl, 2,4 dimethylhexxyl, 2-ethylhexyl, Z-ethylbutyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, hencosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, tricontyl, phenyl, naphthyl, benzyl, o-cresyl, p-cresyl, m-cresyl, dodecylphenyl, octaphenyl, ethylphenyl, diphenyl, pentadecyl, ,B-phenylethyl, omegaphenylhexyl, cyclohexyl, cyclobutyl, cyclopentyl, butenyl, octenyl, 2,3-dimethylpentenyl, 2-ethylhexenyl, linoleyl, oleyl, etc.

The compounds of Formula I above may be prepared,

for instance, by reacting 1 mole of phosphorous pentoxide with 2 moles of a hydroxy compound, or a mixture of hydroxy compounds, in which the hydroxy group is attached to a hydrocarbyl radical of 1 to about 30 carbon atoms to form a dihydrocarbyl diacid pyrophosphate. The dihydrocarbyl diacid pyrophosphate so formed may then be reacted with a suitable amount of a halide of the desired metal dispersed or dissolved in an organic solvent. For example, the metal tetrahalides may be reacted with dihydrocarbyl diacid pyrophosphates in molar ratios of 1:2, 1:3 and 1:4 to form, respectively, metal (IV) bis[di (hydrocarbyl) pyrophosphate]; metal (IV) di- [monoacid di (hydrocarbyl) pyrophosphate] mono [di (hydrocarbyl) pyrophosphate] and metal (IV) tetra [monoacid di (hydrocarbyl) pyrophosphate]. Likewise, metal trihalides may be reacted with dihydrocarbyl diacid pyrophosphates in molar ratios of 1:2 and 1:3 to form, respectively, metal (III) mono [monoacid di (hydrocarbyl) pyrophosphate] mono [di (hydrocarbyl) pyrophosphate]; and metal (III) tri[monoacid di (hydrocarbyl) pyrophosphate]. Additionally, metal dihalides may be reacted with dihydrocarbyl diacid pyrophosphates in molar ratios of 1:1 and 1:2 to form respectively, metal (II) mono [di (hydrocarbyl) pyrophosphate] and metal (II) bis[monoacid di (hydrocarbyl) pyrophosphate].

Advantageously, the metal organo pyrophosphates of Formula I may be prepared by reacting together, in a single step, the metal halide, phosphorous pentoxide and the hydroxy compound in the same relative proportions as given above. For example, if it is desired to prepare a metal (IV) tetra]monoacid di(hydrocarbyl) pyrophosphate], the reactants may be combined in the proportions of 8 moles of hydroxy compound to 4 moles of phosphorous pentoxide to 1 mole of the metal tetrahalide. In a process of this type, the reactants may be simply mixed together at a temperature from about 10 C. to about 120 C., in an inert solvent. The inert solvent is preferably a hydrocarbon such as an aliphatic or an aromatic hydrocarbon, e.g., benzene, toluene, heptane, octane, hexane, etc. However, the inert organic solvent need not be a hydrocarbon, but instead any inert orgarric solvent such as an ether or halogenated hydrocarbon, e.g., ethyl ether, tetrahydrofuran, carbon tetrachloride, chlorobenzene etc., can be employed.

In either method of preparation, identity of the hydrocarbyl groups present in the compounds represented by Formula I is determined by the identity of the hydrocarbyl groups present in the dihydrocarbyl diacid pyrophosphates or hydroxy compounds used as reactants.

The reaction mixtures resulting from the above-noted preparatory procedures may or may not contain minor quantities of additional compounds, not all of which have been entirely identified, in addition to the metal organo pyrophosphates represented by Formula I. Regardless of their identity, these extraneous compounds do not impair the effectiveness of the metal organo pyrophosphate compounds of the present invention as gasoline and lubricating oil additives, and, therefore, need not be separated therefrom. Furthermore, although generally desirable, it is not necessary to separate the compounds of the present invention from the solvent in which they are prepared prior to use.

Illustrative of the metal (11) organo pyrophosphates represented generically by Formula I, there can be mentioned:

calcium mono [di (propyl) pyrophosphate] beryllium bis[monoacid di(isooctyl)pyrophosphate] magnesium bis [monoacid di(isobutyl)pyrophosphate] barium bis [monoacid di (2,4-dimethylhexyl) pyrophosphate] zinc bis [monoacid di(Z-ethylhexyl)pyrophosphate] cadmium mono[mono (4-octylphenyl)mono(octyl) pyrophosphate] copper bis [monoacid di(tricosyl)pyro phosphate] copper mono [di(benzyl) pyro phosphate] nickel mono di Z-ethylhexyl pyrophosphate] nickel bis [monoacid di(2-ethylhexyl) pyrophosphate] nickel mono[di(isodecyl) pyrophosphate] iron bis[monoacid mono(dodecyl)mono (heptadecyl) pyrophosphate] iron bis [monoacid di(butenyl)pyrophosphate] cobalt bis [monoacid di (isobutyl pyrophosphate] cobalt bis[monoacid mono(butyl) mono (tert-butyl) pyrophosphate] manganese mono[di(decyl)pyrophosphate] manganese bis[monoacid mono (pentyl) mono (Z-methylpentyl) pyrophosphate] barium mono [mono (oleyl) mono (phenyl) pyrophosphate] palladium bis [monoacid di (3-methylhexyl) pyrophosphate] palladium mono [di(Z-ethylhexyl)pyrophosphate] platinum mono [mono (Z-ethylhexy) mono (3-methylhexyl) pyrophosphate] chromium bis[monoacid di(2,3-dimcthylhexyl) pyrophosphate] osmium bis [monoacid di (2,4-dimethylhexyl) pyrophosphate] osmium bis[monoacid di (cyclohexyl)pyrophosphate] strontium mono [di (Z-ethylhexenyl)pyrophosphate] Illustrative of the metal (III) organo pyrophosphates represented generically by Formula I, there can be mentioned:

gold tri [monoacid di (2-ethylhexyl)pyrophosphate] gold mono [monoacid di (ethyl)pyrophosphate] mono [di (isohexy1)pyrophosphate] iron tri [monoacid mono (ethylphenyl) mono (dodecylphenyl pyrophosphate] iron tri [monoacid di (3,3-dimethylpentyl) pyrophosphate] iron mono [monoacid di (eicosyl)pyrophosphate] mono [di (eicosyl)pyrophosphate] iron mono [monoacid di (2-ethylhexyl)pyrophosphate] mono [di (Z-ethylhexyl)pyrophosphate] iron mono [monoacid di (triconyl)pyrophosphate] mono [di (triaconyl) pyrophosphate] nickel mono [monoacid di (nonyl)pyrophosphate] mono [di (nonyl)pyrophosphate] nickel tri [monoacid di (isodecyl)pyrophosphate] nickel mono [monoacid mono (heptyl) mono (hexyl) pyrophosphate] mono [mono (heptyl) mono (hexyl) pyrophosphate] nickel mono [monoacid cli (2-ethylhexyl)pyrophosphate] mono [mono (Z-ethylhexyl) mono (isooctyl)pyrophosphate] cobalt tri [monoacid di (2,2,4-trimethylpentyl)pyrophosphate] cobalt tri [monoacid di (dihenyl)pyrophosphate] cobalt mono [monoacid di (cyclopentyl)pyrophosphate] mono [di (cyclopentyl)pyrophosphate] cobalt mono [monoacid mono (pentyl) mono (tridecyl) pyrophosphate] mono [di (pentyl)pyrophosphate] cobalt mono [monoacid mono (hexyl) mono (triaconyl) pyrophosphate] mono [mono (hexyl) mono (triaconyl) pyrophosphate] ruthenium tri [monoacid di (2,2-dimethylbuty1) pyrophosphate] ruthenium tri [monoacid di (phenyl)pyrophosphate] ruthenium mono [monoacid di (2-ethylhexyl)pyrophosphate] mono [di (Z-ethylhexyl)pyrophosphate] osmium mono [monoacid di (dodecyl)pyrophosphate] mono[di (dodecyl)pyrophosphate] rhodium mono [monoacid di (tetracosyl) pyrophosphate] mono [di (ethyl) pyrophosphate] rhodium tri [monoacid di (benzyl)pyrophosphate] iridium mono [monoacid di (undecyl)pyrophosphate] mono [di (undecyl)pyrophosphate] Illustrative of the metal (1V) organo pyrophosphate represented generically by Formula I, there can be mentioned:

manganese bis [di(dodecylphenyl) pyrophosphate] manganese tetra [monoacid di (2-ethylbutyl) pyrophosphate] molybdenum tetra [monoacid di (linoleyl) pyrophosphate] molybdenum bis[di (nonacosyl) pyrophosphate] titanium bis[di (Z-ethylhexyl) pyrophosphate] titanium tetra [monoacid di (2-ethylhexyl) pyrophosphate] titanium di[monoacid di(2-e thylhexyl) pyrophosphate] mono[di (Z-ethylhexyl) pyrophosphate] titanium tetra[monoacid mono (hexyl) mono (heptyl) pyrophosphate] titanium tetra[monoacid di (isodecyl) pyrophosphate] titanium bis[di (isodecyl) pyrophosphate] hafnium bis[di (tertbutyl) pyrophosphate] hafnium di[monoacid di (p-cresyl) pyrophosphate] mono[di (p-cresyl) pyrophosphate] hafnium tetra[monoacid di (Z-ethylhexyl) pyrophosphate] zirconium di[monoacid di (Z-methylhexyl) pyrophosphate] mono[di (methylhexyl) pyrophosphate] zirconium bis[di (docosyl) pyrophosphate] zirconium tetra[monoacid mono (2-ethylhexy1) mono (benzyl) pyrophosphate] ruthenium tetra[monoacid di (butyl) pyrophosphate] platinum bis[di (ethyl) pyrophosphate] platinum tetra[monoacid di (decyl) pyrophosphate] osmium di[monoacid di (beta-phenylethyl) pyrophosphate] mono[di (hexyl) pyrophosphate] iridium di[monoacid di (hencosyl) pyrophosphate] mono[di (hencosyl) pyrophosphate] tin di[monoacid di (cyclohexyl) pyrophosphate] mono[di (hexyl) pyrophosphate] germanium di[monoacid di (m-cresyl) pyrophosphate] mono[di (m-cresyl) pyrophosphate] tin bis[di (2,3-dimethylpentenyl) pyrophosphate] lead bis[di (Z-ethylhexyl) pyrophosphate] silicon tetra[monoacid di (2-ethylbutyl) pyrophosphate] The metal organo pyrophosphates provided by the present invention are useful as gasoline and lubricant additives. As previously noted, particularly desirable metal organo pyrophosphates of the present invention are those which contain at least one acid group (OH) per metal atom, i.e., the metal [acid hydrocarbyl pyrophosphates]. These metal [acid hydrocarbyl pyrophosphates] may be reacted with an organic amine to form amine adducts having exceptional properties as additives in liquid hydrocarbon compositions. Thus, the novel amine adducts of this invention are useful as lubricant additives, anticorrosion additives, detergents, antistall additives, and to reduce octane requirement increase.

The amine adducts can be prepared by simply neutralizing the free acid group or groups of the metal [acid hydrocarbyl pyrophosphates]. Formation of the adduct takes place at a temperature between about 15 C. and 60 C. Preferably, each of the acid groups of the pyrophosphate is neutralized with basic nitrogen of the amine reactant, although this is not essential. Neutralization can be accomplished by simply adding the amine to the metal [acid hydrocarbyl pyrophosphate] to raise the pH thereof to at least 6 or 7. Also, the neutralization can be accom plished by adding a stoichiometric quantity of the amine to the metal [acid hydrocarbyl pyrophosphate] The amine employed in preparing the amine adducts of the present invention can be any salt-forming amine having from 1 to about 30 carbon atoms. Thus, primary, secondary, tertiary, aliphatic, aromatic or alicyclic amines may be used. The cyclic amines can be carbocyclic or heterocyclic. The amine can also be a mono-, di-, tri-, or other polyamine. Furthermore, the amine may be a B-amine and may contain various substituent groups such as hydroxyl groups. Preferred amines useful in the practice of the invention are aliphatic, monoor polyamines containing 6 to 22 carbon atoms arranged in an alkyl or alkenyl chain.

Illustrative of suitable amines for preparing the amine adducts of the metal organo orthophosphates and pyro phosphates there can be mentioned: methylamine, ethylamine, diethylamine, propylamine, tripropylamine, isopropylamine, butylamine, isobutylamine, hexylamine, 2- ethylhexylamine, octylamine, dodecylamine, 2-propyldecylamine, pentadecylamine, tetradecylamine, octadecylamine, fi-butyloctadecylamine, eicosamine, 6,6-dimethyl i-propyldecylamine, 8 hexyl 10 isobutyloctadecylamine, dioctylamine, tribenzylamine, hexadecylamine, decylamine, N-hexyloctylamine, N,N-dimethyldodecylamine, oleylamine, linoleylamine, 1,10-decamethylenediamine, ethylenediamine, 1,2-propylenediamine, 1,12-dodecamethylenediamine, tetramethylenediamine, 1,6-hexamethylenediamine, tetramethylenediamine, 1,6-hexamethylenediamine, triethylenetetramine, 1,2-phenylenediamine, benzylamine, 3,3 biphenyldiamine, biphenylamine, lnaphthylamine, l-fluorenamine, aniline, N-methylaniline, N,N-dimethylaniline, 2,3-phenylenediamine, piperazine, piperidine, furfurylamine, N-cyclohexylheptylamine, and the like; The amines can also contain various substituent groups such as hydroxyl groups, e.g., alkanol amines, such as diethylanolamine, 3,3-hydroxydipropanolamine, isopropanolamine, and the like. B-Amine, such as octylfl-amine, can also be used. Mixtures of amines may also be used to prepare the amine adducts of the present invention. For instance, cocoamine, which is a mixture of amines prepared from coconut oil fatty acids and contains predominantly n-dodecylamine, and soya amine, which is a mixture of amines containing 16 to 18 carbon atoms, are especially useful.

The amine adducts provided by the invention may be represented by the following formula:

FORMULA II 7 wherein M is metal having a valence of 2 to 4 and particularly an element selected from the group consisting of manganese, chromium, molybdenum, copper, gold and silicon and the metals of Groups II, IV and VIII of the Periodic Table; each of R, R, R and R are hydrocarbyl groups having from 1 to about 30 carbon atoms; 11 is an integer from 1 to 4; n is an integer from to 1; the sum of n plus 211' is equal to the valence of the metal and is an integer from 2 to 4; and A is an amine containing from 1 to about 30 carbon atoms.

Representative of such amine adducts are:

beryllium bis[mono (cocoammonium) di(isooctyl) pyrophosphate] magnesium bis[mono (oleylammonium) di(isoamyl) pyrophosphate] zinc bis[mono (propylamrnonium) di(Z-ethylhexyl) pyrophosphate] nickel bis[mono (cocoammonium) di-(Z-ethylhexyl) pyrophosphate] iron bis[mono (dodecylammonium) mono (dodecyl) mono (heptadecyl) pyrophosphate] manganese bis[mono (linoleylammonium) mono (pentyl) mono (Z-methylpentyl) pyrophosphate] chromium bis[mono (heptadecylammonium) di(2,3-di

methylhexyl) pyrophosphate] gold tri[mono (decadienylammonium) di(2-ethy1hexyl) pyrophosphate] iron tri[mono (cyclohexylammoniurn) mono (ethylphenyl) mono (dodecylphenyl) pyrophosphate] nickel mono[mono (nonylammonium) di(nonyl)pyrophosphate] mono [di(nonyl) pyrophosphate] cobalt mono[mono (tridecylammonium) mono (pentyl) mono (tridecyl) pyrophosphate] mono[di(pentyl) pyrophosphate] ruthenium tri[mono (tetradecylammonium) di(phenyl) pyrophosphate] rhodium tri[niono (benzylammonium) di(benzyl) pyrophosphate] molybdenum tri[mono (heptadecylammonium) di(heptadecyl) pyrophosphate] titanium tri[mono (6-butyloctyldecylammonium) di(isodecyl) pyrophosphate] titanium di[rnono (isobutylamine) mono (propyl) mono (butyl) pyrophosphate] mono[mono (amyl) mono (hexyl) pyrophosphate] manganese tetra[mono (Z-ethylbutylammonium) di(2- ethylbutyl) pyrophosphate] amine adduct of 1,6-tetrahexylenediamine and molybdenum tetra[monoacid di(octyl) pyrophosphate] titanium di[mono (oleylammonium) di(2-ethylhexy pyrophosphate] mono[di(Z-ethylhexyl) pyrophosphate] titanium tetra[mono (oleylammonium) di(Z-ethylhexyl) pyrophosphate] titanium tetra[mono (cocoammonium) di(Z-ethylhexyl) pyrophosphate] titanium di[mono (cocoammonium) di-(2ethylhexyl) pyrophosphate] mono[di(2-ethylhexyl) pyrophosphate] titanium tetra[mono (isodecylammonium) di(isodecyl) pyrophosphate] hafnium di[mono (cyclopentylammonium) di(p-cresyl) pyrophosphate] mono[di(p-cresyl) pyrophosphate] zirconium tetra[mono(butylammonium) mono(2-ethylhexyl) mono(benzyl) pyrophosphate] amine adduct of ethylenediamine and ruthenium tetra [monoacid di(butyl) pyrophosphate] amine adduct of aniline and platinum tetra(monoacid di(decyl) pyrophosphate] amine adduct of beta-aminooctadecene and germanium tetra[monoacid di(decyl) pyrophosphate] Particularly preferred amine adducts for use in hydrocarbon compositions are those represented by Formula II above, wherein M is a Group IV-B metal (e.g., titao nium), each R, R, R" and R' is a branched-chain hy drocarbyl radical having from 6 to 22 carbon atoms, (e.g., 2-ethylhexyl), n is 0, n is 4, and A is an amine containing from 6 to 22 carbon atoms arranged in an aliphatic hydrocarbyl group, which may be alkyl or alkenyl.

When used as gasoline additives, the compositions of the present invention, namely metal [hydrocarbyl pyrophosphates], metal [acid hydrocarbyl pyrophosphates] and amine salts of metal [acid hydrocarbyl pyrophosphate], are used in an amount between 10 and about 500 parts per million parts of gasoline by weight, preferably from to about 250 ppm. and particularly from about 25 to 200 ppm. The gasoline composition can be either leaded or unleaded, although leaded gasoline is preferred. In accordance with the preferred embodiment of the invention a gasoline composition is provided which comprises a major portion of leaded hydrocarbon base fuel boiling in the gasoline range and containing between 10 and 500 ppm. of the amine salts represented by Formula II above, and particularly the salts obtained by reacting an amine containing from 6 to 22 carbon atoms arranged in an aliphatic hydrocarbyl group with a metal (IV-B) [monoacid di (branched-chain C to C hydrocarbyl) pyrophosphate]. It will be understood that the terms gasoline, hydrocarbon base boiling in a gasoline range and similar terms refer to a petroleum fraction boiling in the gasoline range (e.g., between F. and about 450 F.). The term leaded gasoline refers to gasoline to which there has been added a small amount, such as between 0.1 and about 6.0 ml. per gallon of metallo organic antiknock compound such as tetraethyl lead (TEL), tetramethyl lead (TML), tetraisopropyl lead, etc.

In addition to the additives of the present invention and optionally the lead antiknock compounds, the gasoline compositions of this invention can also include, for instance, light hydrocarbon lubricating oils having viscosities at F. of between about 50 and about 200 Saybolt Universal seconds (SSU) and viscosity indexes of between about 30 and about 130. Such oils may be present in suitable amounts such as between about 0.1 and about 1.0% by weight of the gasoline composition.

When employed in lubricating compositions, such as lubricating oils, the additives provided by the present invention improve the boundary lubrication properties of the composition. Thus, lubricants containing the additives of this invention inhibit the stick-slip sliding tendencies that are often found in automatic transmission clutching surfaces.

In preparing lubricant compositions with the additives of this invention, it has been found that the amount of additive can vary over a Wide range such as from 0.01% to about 3%, by weight, of the lubricant base material. The amine salts of the metal [acid hydrocarbyl pyrophosphates] are particularly desirable lubricating oil additives. In preparing lubricant compositions a wide variety of both mineral oil and synthetic base stock, including mixtures of the same, can be used. Suitable mineral oil base materials include 100 and 200 neutral oils, light and heavy intermediate mineral oils, bright stock as Well as combina tions of the foregoing. If a synthetic base material is used, it can be that of diesters, polyesters, silicones, silicates, fluorocarbons, phosphates and the like.

In addition to gasoline and lubricating oil compositions, the additives of the present invention may also be used in other hydrocarbon compositions. For example, they may be used in minor quantities of diesel fuel oil compositions to impart antirust activity, etc., to the composition.

The invention will now be further described with reference to the following specific and illustrative examples:

EXAMPLE 1 Titanium tetra[monoacid di(2-ethylhexyl) pyrophosphate] is obtained by reacting phosphorous pentoxide,

titanium tetrachloride and 2-ethyl-1-hexanol as shown below:

wherein R is 2-ethylhexyl.

To a suitable reaction vessel equipped with a mechanical stirrer, stoppered pressure equalizing addition funnel, thermometer, gas inlet tube, and a reflux condenser protected with a drying tube, there are added 400 ml. of anhydrous n-heptane and 61.0 g. (0.43 mole) of phosphorous pentoxide. With the stirrer operating at a rate to insure a uniform dispersion, 20.4 g. (0.11 mole) of titanium tetrachloride are added next. Finally, 112 g. (0.86 mole) of 2-ethyl-l-hexanol, contained in the pressure equalizing addition funnel, is charged into the reaction vessel at a rate such that the temperature of the reactants does not rise above 36 C. When this step is completed, the solution is homogeneous. The reactants are then heated under reflux at 88 C. to 100 C., and when evolution of hydrogen chloride moderates, dry air is passed through the solution to displace the acid gas more rapidly and to accelerate the reaction. When evolution of hydrogen chloride ceases, as revealed by Congo Red indicator, the n-heptane and any unreacted 2-ethyl-1- hexanol are removed by distillation in vacuo. The final temperature of the light yellow residual product in the reaction vessel is 125 C. at 6 mm. The product is very viscous and weighs 175 g., which is 96% of theory based on the metal halide. Upon analysis, the product is found to contain 2.98% titanium and 15.36% phosphorous, theory being 2.89% titanium and 14.99% phosphorous.

EXAMPLE 2 In the manner described in Example 1, a mixture of 0.4 mole (56.8 g.) of P and 0.1 mole (23.3 g.) of ZrCl in 500 ml. of anhydrous n-heptane is reacted with 0.84 mole (133 g.) of isodecyl alcohol to form zirconium tetra[monoacid di(isodecyl) pyrophosphate], which is represented by the following formula:

wherein R is isodecyl.

EXAMPLE 3 be represented by the following formula:

OR R0 wherein two of the R groups are isodecyl and the two remaining R groups are octylphenol.

EXAMPLE 4 A mixture of 0.2 mole (56.8 g.) of P 0 and 0.1 mole (27.2 g.) of cadmium bromide is finely dispersed by vigorous stirring in 400 ml. of a reaction medium consisting of equal volumes of n-heptane and toluene. Then 0.42 mole (55 g.) of iso-octanol is added in the manner described in Example 1. The reactants are heated under reflux at 98 C. C. until liberation of byproduct HBr is completed. The solvent is removed by distillation at lower pressure to obtain as the residue cadmium bis- [monoacid di(iso-octyl) pyrophosphate] as shown below:

wherein R is iso-octyl.

EXAMPLE 5 To a mixture of 4 moles (568 g.) of P 0 and 1 mole (170 g.) of SiCl in 1500 ml. of dry n-heptane, there is added 8.4 moles (1683 g.) of tridecanol in the manner described in Example 1. Upon completion of the reaction, as evidenced by no further liberation of HCl at 95 C., the n-heptane and any remaining tridecanol are removed by distillation at C. and 2 mm. pressure. The remaining viscous product is silicon tetra[monoacid di(tridecyl) pyrophosphate].

EXAMPLE 6 The titanium tetra[monoacid di(2-ethylhexyl) pyrophosphate] product of Example 1 is mixed with various amines to obtain products having a pH of 7. The reactants are thoroughly mixed at room temperature while pro tected from carbon dioxide in a vessel blanketed with air. The amounts of amines employed to obtain adducts of pH 7 are given in the following tabulation:

Grams amine to make adduct of pH 7 with 10 grams of titanium tetra [monoacid di (Z-ethylhexyl) Amine: pyrophosphate] Cocoamiue (C 8.51 Soya amine (C 10.30 Oleylamine (C 11.20 N-oleyl-1,3-propylene diamine 7.94

The following example illustrates the use of each of the above-noted amine adducts as an additive in lubricants.

EXAMPLE 8 A measure of the boundary lubricating ability of each of the amine adducts of titanium tetra [monoacid di (2- ethylhexyl) pyrophosphate] of Example 7 in lubricating oil, and consequently their effectiveness in reducing wear, is obtained by means of a special apparatus used to assess the boundary properties of lubricants in the 50 F.-350 F. range. The measurement is reported as Normal Lubric- 1 1 ity Indices, NLI, and values of 200 and above are considered very good.

One part by weight of the various amine adducts is blended with 99 parts by weight of a neutral oil having a viscosity of 100 SUS at 100 F. The NLI values are set forth in the following tabulation:

Friction modifier: Normal lubricity index None 100 Titanium tetra [cocoammonium di (Z-ethylhexy) pyrophosphate] 257 Titanium tetra [soya ammonium di (2-ethylhexyl) pyrophosphate] 315 Titanium tetra [oleylammonium di (2-ethylhexyl) pyrophosphate] 370 Amine adduct of N-oleyl-1,3-propylene diamine and titanium tetra [monoacid di (Z-ethylhexyl) pyrophosphate] 386 The following example illustrates the use of the amine adducts of Example 7 as additives in gasoline compositions.

EXAMPLE 9 Gasoline compositions are prepared by employing each of the previously-noted amine adducts of titanium tetra [monoacid di (2-ethylhexyl) pyrophosphate] in an amount of 50 p.p.m. in a base gasoline having the following characteristics:

Distillation:

IBP101 F. 10% evaporationl30 F. 20%149 F. 30%168 F. 50%-210 F. 70%-260 F. 90%-328 F.

End point-409 F. Recovery-98 .5 Residue-1 Gravity- 8.2 API ASTM rust tests are run at 75 F. with each of the additive-containing gasoline compositions using distilled water. Each of the compositions passed the test.

While the invention has been described above with respect to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as expressed in the appended claims.

Therefore, I claim:

1. A lubricating composition comprising a major quantity of lubricant base material and a minor quantity suflicient to impart lubricity of an adduct of an amine containing from 1 to about 30 carbon atoms with a comwherein M is a polyvalent metal; n is an integer of from 1 to 4; n is an integer of from 0 to 1; the sum of n plus 2n is equal to the valence of the metal and is an integer from 2 to 4 and R, R, R and R" are hydrocarbyl groups having from 1 to about 30 carbon atoms.

2. A lubricating composition comprising a major quantity of mineral oil and dissolved therein from about 0.01 to about 3%, by weight, of an adduct of an amine containing from 1 to about 30 carbon atoms with a compound having the formula:

wherein M is a polyvalent metal; 11 is an integer of from 1 to 4; n is an integer of from 0 to 1; the sum of 11 plus 2n is equal to the valence of the metal and is an integer of from 2 to 4; and R, R, R" and R' are hydrocarbyl groups having from 1 to about 30 carbon atoms.

3. A lubricating composition of claim 2 wherein M is selected from the group consisting of manganese, chromium, molybdenum, copper, gold and silicon and the metals of Groups II, IV and VIII of the Periodic Table.

4. A lubricating composition of claim 2 wherein R, R, R" and R' are aliphatic hydrocarbyl groups.

5. A lubricating composition of claim 4 wherein R, R, R" and R' are branched-chain aliphatic hydrocarbyl groups having from about 6 to about 22 carbon atoms, and said amine is an aliphatic amine containing from about 6 to about 22 carbon atoms.

6. A lubricating composition of claim 3 wherein M is a Group IV-B metal, 11 is 2 and n is 1, and said amine is an aliphatic amine containing from 6 to about 22 carbon atoms.

7. A lubricating composition of claim 3 wherein M is a Group IV-B metal, n is 4 and n is 0, and said amine is an aliphatic amine containing from 6 to about 22 carbon atoms.

References Cited UNITED STATES PATENTS 2,228,659 1/1941 Farrington et al. 252-32.5 2,301,370 11/1942 Cook et al.

2,345,156 3/1944 Roberts 25232.5 XR 2,777,874 1/1957 Asseif et a1 260-431 XR 2,857,334 10/1958 Thompson.

3,012,056 12/ 1961 Cyba.

3,063,820 11/1962 Chenicek 252-325 XR 3,305,330 2/1967 McCoy et al.

3,334,978 8/1967 Revukas.

3,338,935 8/1967 Kerschner.

DANIEL E. WYMAN, Primary Examiner I. VAUGHN, Assistant Examiner US. Cl. X.R. 2523 89 

